BA 1378 then FR 1917 at Manchester
London Heathrow → Manchester → Dublin
Timetable, Manchester time
18:35BA 1378 from London Heathrow at the gate
15:50FR 1917 to Dublin leaves the gate
21 h 15 apart on the timetable, overnight
FR 1917 leaves 21 h 15 after BA 1378 arrives on the timetable: more than half a day, so not a connection we count.